Frequencies for first 10,000 rows of birday variable in natl1971 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        351        3.51        3.51
          2 |        339        3.39        6.90
          3 |        351        3.51       10.41
          4 |        307        3.07       13.48
          5 |        360        3.60       17.08
          6 |        353        3.53       20.61
          7 |        331        3.31       23.92
          8 |        345        3.45       27.37
          9 |        351        3.51       30.88
         10 |        323        3.23       34.11
         11 |        367        3.67       37.78
         12 |        344        3.44       41.22
         13 |        356        3.56       44.78
         14 |        339        3.39       48.17
         15 |        352        3.52       51.69
         16 |        323        3.23       54.92
         17 |        306        3.06       57.98
         18 |        324        3.24       61.22
         19 |        341        3.41       64.63
         20 |        346        3.46       68.09
         21 |        297        2.97       71.06
         22 |        344        3.44       74.50
         23 |        328        3.28       77.78
         24 |        305        3.05       80.83
         25 |        331        3.31       84.14
         26 |        364        3.64       87.78
         27 |        310        3.10       90.88
         28 |        299        2.99       93.87
         29 |        242        2.42       96.29
         30 |        216        2.16       98.45
         31 |        154        1.54       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016